longstaff

In the text the servo motor is supposed to give 180 degree of motion, even suggesting cutting out a "half circle" to make the dial on.My servo is only giving me 90 degree motion, which is supported by the picture on page 69 giving only a quarter circle for the dial.

Anyone know which one is supposed to be correct? or which is working for you?

In the text the servo motor is supposed to give 180 degree of motion, even suggesting cutting out a "half circle" to make the dial on.My servo is only giving me 90 degree motion, which is supported by the picture on page 69 giving only a quarter circle for the dial.

Anyone know which one is supposed to be correct? or which is working for you?

Not all servos can actually move a full 180 degrees, that is just an assumption the arduino servo library uses. Perhaps a link to your specific servo may shed light on the topic?

Lefty

longstaff

on further study there is an obvious number on it that is a product code (SM-S2309S) that states movement of about 60 degrees on the data sheets, so its just incorrectly stated in the book.next time I might actually look at the component...

on further study there is an obvious number on it that is a product code (SM-S2309S) that states movement of about 60 degrees on the data sheets, so its just incorrectly stated in the book.next time I might actually look at the component...

Thanks

Well the datasheet I found doesn't give the total travel range. http://www.servodatabase.com/servo/springrc/sm-s2309s

The spec listed:

Quote

4.8V: 0.12 sec/60°6.0V: 0.10 sec/60°

Is a speed specification telling how many degrees it can move in so much time at what operating voltage.

The total range specification is shown as:

Quote

Rotational Range: ? (add)

Lefty

JohnClavis

That's the exact model # of the servo listed on the arduino website (arduino.cc)! You can read the # on the sticker on the photo of the servo! Just look up "servo" -- there's only a couple! They list the range of movement as 180 degrees! It's right there on their site! I'm about to order one based on the assumption that it's accurate! I hope it is!

I tried my sevo, from the Starter Kit, it moves almost 180°But I was thinking that, if you reference the movement of your servo to a voltage, like in the Project05, when you map the voltage values and angles you assume that the output of the pot will be 0 to 5Vdc.Well make sure it happens, maybe for some reasons you have lower maximum output and so you will never get to 180°, in this case you have to remap using the max voltage you can get...Probably it is not your case, but it may help someone else in future...